The term 'WEAVER's Device' refers to two tools used by weavers in the production of textiles. The first tool is a LOOM, which is a device used to interlace two sets of threads or yarns together in order to create fabric. The second tool is a sley, which is a comb-like device used to separate the warp threads in a LOOM and to regulate the size of the shed. Together, these two tools are essential for weaving cloth and other fabrics.